Anon
  • Member for 6 years, 2 months
  • Last seen more than a week ago
How many $4\times4$ normal magic squares have all subsquares sum to the magic constant?
Accepted answer
5 votes

After some further thought, I've realised why Joriki's answer is correct (i.e. why all $4\times4$ magic squares satisfying $(2)$ are panmagic and most-perfect). It's too long to put in a comment, so I'...

View answer
The Perfect Sharing Algorithm (ABBABAAB...)
4 votes

This sequence is the Thue-Morse sequence about which you can find quite a bit online; you can find a plethora of facts about it at the Online Encyclopedia of Integer Sequences as pointed out by Q the ...

View answer
Can anyone explain why language concatenation works like this
Accepted answer
3 votes

Your idea of concatenating something with nothing is on the right track. The reason $A\cdot\{\}=\{\}$ is because the process of language concatenation (as opposed to string concatenation) is defined ...

View answer
Rational function approximation to square root
Accepted answer
1 votes

From the many good answers and comments to this question, especially those of Peter and Barry Cipra, I think I’ve come to understand the answers to most of my questions. Since none of the answers by ...

View answer